Funding for this research was provided by:
Ministry of Education, Culture, Sports, Science and Technology (JP21119003)
Japan Society for the Promotion of Science (JP16H06398)
Received: 18 February 2020
Accepted: 2 July 2020
First Online: 20 July 2020
Ethics approval and consent to participate
: This study was approved by The Research Ethics Committee of the Graduate School of Medicine/Faculty of Medicine, The University of Tokyo (no. 1691-(5)). Written informed consent was obtained from all participants with full disclosure and explanation of the purpose and procedures of this study. We explained that their participation was voluntary, and they could withdraw from the study at any time even after voluntarily participating without offering any reason. Participants were assured that the survey was anonymous, and no individual would be identified in analyzing and reporting the data.
: Not applicable.
: None declared.